Jamie Lynn Spears' 8-year-old daughter Maddie was badly injured in an ATV accident on Sunday (Feb. 5), and the young girl's grandfather is asking for prayers for his granddaughter.

On Sunday night, TMZ reported that Maddie was riding a Polaris off-road vehicle in Kentwood, La., when the vehicle flipped over. According to the website's sources, the child was unconscious and under water for "several minutes," and she was taken to a nearby hospital; in an update, TMZ added, via "sources connected with the family," that Maddie was later airlifted to a hospital in New Orleans and is in "critical but stable" condition.

According to Sheriff's Office officials, deputies responded to the incident, along Highway 51 in Fluker, La., around 3PM on Sunday. Officials say that Maddie -- whom they did not identify in their report -- was trying to avoid running over a drainage ditch and overcorrected her course, running the ATV into a pond.

Spears and Watson, Maddie's stepfather, tried to rescue her, officials say, but she was trapped by the vehicle's seatbelt and safety netting. An ambulance arrived within two minutes and freed her, and the report notes that Maddie is in stable but critical condition.

"Right now," a rep for Spears' sister, pop star Britney Spears, adds, "the Spears family asks that everyone respect their privacy during this time and appreciates all the prayers and support for their family."

Jamie Lynn Spears herself has yet to comment on the accident. She shares custody of Maddie with the girl's father, Casey Aldridge.

Spears became pregnant with Maddie in 2007, at the age of 16; the singer and Aldridge, then girlfriend and boyfriend, got engaged in the spring of 2008, and Maddie was born in June of that year. However, the couple called off their engagement in the spring of 2009, and their relationship officially ended in early 2010. Spears married Watson in 2014.